The pink dots are probably from improper washing from the photo developer. It takes a while for the results to show up. If it was from exposure to sunlight, the color fade would be more consistent across the whole print.

Process the film as is and get the usable prints. Don’t bother trying to salvage the unexposed area, you don’t apparently have the equipment or know-how to do so.

At some point I would take at least one of them through the entire process. Show, don’t tell, what it takes to do a a shoot. Perhaps a more subtle way to show the time and effort involved.